I'm a junkie for Lineman. Admittedly so. The single most glaring need on this team is the offensive line. However, the draft is not our only source for players/talent, and it has been proven time and time again that OLinemen can be found later.
I'm now interested in the 2010 draft for one reason, and one reason alone. Assuming we have a top 3 pick as you've stated (which I believe is presumable)....and he's still available...there's no decision to make.
And I have ZERO ties to USC. But you have to respect Pete Carrol's defensive teachings, and this kids size/talent is unmatched. You take him, you pay him, and our defense is improved ten-fold.